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Abstract

The recent in-vessel enhancements of Tore Supra make it possible to sustain long duration non-inductive discharges and to study steady state scenarios in preparation for ITER using the lower hybrid current drive as the main power source. Its deposition profile can be deducted from the measurement of the hard X-ray emissivity produced by the suprathermal electrons that are generated by the absorption of the lower hybrid wave.
In Tore Supra, a very effective spectrometric diagnostics is operating in order to get hard X-ray emissivity information in the energy range between 20 and 200 keV. Recently this diagnostics has been connected to the real-time data network. The availability of the integrated electron emissivity signals in real-time allowed the development of an ad hoc algorithm for the computation of the local emissivity profile of suprathermal electrons. The code computes a local emissivity profile by means of Bessel expansions, and supplies data to the real-time data network each 16 ms, a time that is well below the resistive time of the physical process (about 100 ms). A description of the main code issues is given inside the article, together with an overview of its robustness, limits and real-time performance.

Additional information

Authors: BARANA O et al, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at:14th IEEE-NPSS Real Time Conference Organised by: IEEE NPSS Computer Applications in Nuclear and Plasma Sciences, AlbaNova, Stockholm (SE) Held at: AlbaNova University Centre, Stockholm(SE)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, FranceL%Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
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